Electromagnetic chuck



Patented Oct. 6, 1925.

UNITED STATES PATENT OFFICE.

WEB G. BERGER, OF CANTON, OHIO, ASSIGNOR TO THE TIMKEN ROLLER BEARINGCOMPANY, 01' CANTON, OHIO, A CORPORATION OF OHIO.

ELECTROMAGNETIC CHUCK.

Application fled June 5, 1822. Serial 110. 588,115.

To all whom it may concern:

Be it known that I, ALEXANDER G. R11- BERGER, a citizen of the UnitedStates, and a resident of the city of Canton, county of 5 Stark, andState of Ohio, have invented a new and useful Improvement inElectromagnetic Chucks, of which the following is a s cification.'

invention relates to electro-magnetic chuc s and has for its rincipalobjects to provide such chucks wit face plates whose work engagingsurface will not be easily marred or worn down by the work mountedthereon.

The invention consists principally in making the surface portion of theface plate of hardened steel.

In the drawin which forms part of this s ecification an wherein likereference c aractersindicate like parts wherever they Fi 1 is asectional view of a magnetic chuc embodying my invention; and

Fig. 2 is a' sectional view of s. modified form thereof.

The present invention is applicable to magnetic chucks of any type. Inthe drawing, the invention is shown embodied in a chuck of the rotarytype comprising a body 1 in which is mounted the usual electricinduction coil or coils 2. Mounted on the body are ole pieces 3 that areadapted to be enei gize b the electric current passing through the coiSaid pole pieces 3 are arranged so that the north and south olesalternate, as will be readily understoo The 5 aces be tween the polepieces are filled wit lead t or some other non-conducting material. The

ends of the pole pieces and the spacers are formed into a smooth surfaceon which the work is mounted. The pole pieces 3 and the spacers 4 arecommonly designated as the face plate of the chuck.

The pole pieces are made of soft iron or steel and are likely to beroughened or ra idly worn down by contact with the wor In order toprevent this, I case-harden the ends of the pole pieces, as indicated inthe drawing by the stippling, thus providing hard metal for the work toabut against.

In Fig. 2 is shown a modified form of the invention, in which the faceplate is provided with a shallow recess 20 adapted to fit the work 21that is to be secured to the chuck. This prevents slip ing of the workand permits it to be easi y centered. The chuck is also provided with acentral bore to accommodate a grinding wheel or other tool.

The chuck above described has numerous advanta es. The face plate isdurable and not light y to be rou hened or grooved by eng agement withsteel or other hard olnects.

he work engaging surface is thus kept true, which is an importantadvantage. The recess of the face plate shown in Fig. 2, provides simplemeans for center-in the work and prevents slipping of the wor r acrossthe face of the chuck.

What I claim is:

An electro-magnetic chuck havinga slate whose work engaging surface ishardened.

Signed Canton, this 31st day May, 192?.

